Metallorganic precursor

Volatile metallorganic precursors for depositing inorganic electronic materials (24). 

Meriani, S., 1989, Mater. Sci. Eng. A 109, 121. Meriani, S., and G. Soraru, 1983, Ultra fine ceria zirconia powders obtained via metallorganic precursors, in Ceramic Powders, ed. P. Vicenzini (Elsevier, Amsterdam) pp. 547-554. 

The opportunities afforded the conservator by the use of metallorganic precursors are unique, diverse and exciting. Whereas simpler systems like inorganic silicates have been known for some time, some of their limitations can now be overcome with the use of more advanced materials like organic-inorganic hybrids. However, much additional work must be done in this field in order to conservators to be aware of these possibilities. It is interesting to quote C.A. Price (Price, 1996) on the development of the sol-gel process in the field of conservation ... 

The use of metallorganic precursors also allows for a clean route to metal oxide nanoparticles. By employing diethyl zinc as a starting material, Williams and coworkers have shown that ZnO epoxy-resin nanocomposites and ZnO-coated carbon nanotubes may be prepared. The benefit of this method is the lack of undesirable by-products here, only ethane is produced. Given the pyrophoric nature of diethyl zinc, this reaction should be carried out under inert conditions. Ionic liquids too have been used in the low temperature synthesis of ZnO nanoparticles. Li et al. have employed 1-butyl-3-methylimidazolium chloride, in conjunction with zinc acetate and sodium hydroxide, to prepare hexagonal wurtzite ZnO nanoparticles which were formed upon simple grinding at room temperature for under an hour. ... 

Fe, O, nanocrystals by hydrothermal decomposition of a metallorganic molecular precursor. Materials Science and Engineering B, 157 (1-3), 81-86. 

Besides the continuous fibers, application of metallorganic polymers to heat-resistant coatings, dense ceramic moldings, porous bodies, and SiC matrix sources in advanced ceramics via polymer infiltration pyrolysis (PIP) have been developed. Novel precursor polymers have been synthesized and investigated for ceramics in addition to PCS (Table 19.1). For SiC ceramics, various Si-C backbone polymers have been synthesized. Their polymer nature (e.g., viscosity, stability, cross-linking mechanism, and ceramic yield) are, however, fairly different from PCS. On the other hand, polysilazane, perhydropolysilazane, polyb-orazine, aluminum nitride polymers, and their copolymers have been investigated... 

Several kinds of ceramics prepared from metallorganic polymers have been described. By controlling the precursor and conversion process, polymer precursor ceramics have the possibility to form novel types of structure, such as an interpenetrated microstructure, that is different from that of earlier ceramics. 

Hereafter, some examples are presented to illustrate the large variety of molecular (discrete) organic and metallorganic compounds that have been successfully incorporated inside the pores of MOFs. Most often, these systems have been prepared by adding the species directly during the synthesis of the MOF, though some limited examples also exist on the assembly of precursors inside the pores. 

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